feat: page interactive, démos Play/Step et simulateur Carnot

Ajoute le pipeline PageSpec (validation, rendu, publication /p/{slug}),
les démos TipTap /demo, et le simulateur Carnot (modes frigo/PAC/moteur,
énergie kJ vs puissance W, unités K/°C/°F) avec correctifs d’équations KaTeX.

Co-authored-by: Cursor <cursoragent@cursor.com>

memento-note/lib/interactive-demo/index.ts

@@ -0,0 +1,40 @@
+export {
+  INTERACTIVE_DEMO_CAPS,
+  INTERACTIVE_DEMO_SCHEMA_VERSION,
+  PATTERN_IDS,
+  INTENT_IDS,
+  SCOPE_IDS,
+  ANNOTATION_KINDS,
+  PANEL_TYPES,
+  CHART_TYPES,
+  HUMAN_STRING_KEYS,
+  SPEAK_WRITING_RULE,
+} from './constants'
+export {
+  SPEAK_WRITING_GUIDE,
+  intentColor,
+  dimOpacity,
+  spotlightColor,
+} from './intent-colors'
+export { interactiveDemoV1Schema } from './schema'
+export {
+  validateInteractiveDemo,
+  assertTranslatePreservesStructure,
+  collectSceneElementIds,
+  heatmapCellIds,
+} from './validate'
+export { normalizeInteractiveDemoCandidate } from './normalize'
+export {
+  resolveInteractiveDemo,
+  resolveActFinalState,
+} from './resolve'
+export type {
+  InteractiveDemoV1,
+  ValidationResult,
+  ValidationIssue,
+  DemoAct,
+  DemoStep,
+  DemoScene,
+  Panel,
+} from './types'
+export type { StepResolvedState, ActResolvedState, ResolvedAnnotation } from './resolve'